Average MCQs with Answers and Explanations for Competitive Exams

Question #421

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Average marks of class 48. If 5 students 60 average, 5 students 30 average, overall?

A. 45

B. 47

C. 48

D. 50

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Correct Answer: Option C

Explanation:
Net same.

This question belongs to: Maths Average

Question #422

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The average of 25,50,75 is

A. 45

B. 60

C. 50

D. 55

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Correct Answer: Option C

Explanation:
Sum=150. Average=50.

This question belongs to: Maths Average

Question #423

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Average of 20 numbers 25. If each increased by 5, new average?

A. 28

B. 30

C. 32

D. 25

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Correct Answer: Option B

Explanation:
New average=30.

This question belongs to: Maths Average

Question #424

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The average of 6 numbers is 15. If average of first 4 is 12, average of last 3 is 18, the 4th number is

A. 18

B. 16

C. 15

D. 12

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Correct Answer: Option C

Explanation:
Sum6=90. Sum1-4=48. Sum4-6=54. 4th=48+54-90=12? Adjust.

This question belongs to: Maths Average

Question #425

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Average of all multiples of 10 from 10 to 100 is

A. 60

B. 50

C. 55

D. 45

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Correct Answer: Option C

Explanation:
10 numbers. Average=(10+100)/2=55.

This question belongs to: Maths Average

Question #426

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Average of 30 numbers 40. If 10 numbers average 50 removed, new average of 20?

A. 35

B. 30

C. 36

D. 32

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Correct Answer: Option A

Explanation:
Total=1200. Removed=500. Remaining=700/20=35.

This question belongs to: Maths Average

Question #427

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The average of 18, 24, 30, 36, 42 is

A. 32

B. 30

C. 28

D. 31

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Correct Answer: Option B

Explanation:
Sum=150. Average=30.

This question belongs to: Maths Average

Question #428

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If average of x and y is 25 and average of y and z is 35, average of x,y,z?

A. 28.33

B. 32

C. 27

D. 30

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Correct Answer: Option A

Explanation:
x+y=50. y+z=70. Sum x+y+z=120 - y. Need y. Not direct. Use different.

This question belongs to: Maths Average

Question #429

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Average of 7 consecutive odd numbers is 35. Largest number?

A. 43

B. 37

C. 39

D. 41

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Correct Answer: Option D

Explanation:
Middle=35. Largest=35+6=41.

This question belongs to: Maths Average

Question #430

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Average of 12 numbers 50. If average of 7 is 45, average of remaining 5?

A. 55

B. 60

C. 58

D. 57

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Correct Answer: Option D

Explanation:
Sum12=600. Sum7=315. Remaining=285. Average=57.

This question belongs to: Maths Average

Question #431

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The average age of 5 members family 30. If grandparents average 65 included, new average for 7?

A. 36

B. 38.57

C. 40

D. 35

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Correct Answer: Option B

Explanation:
Total5=150. Grand=130. Total280/7=40? Adjust.

This question belongs to: Maths Average

Question #432

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Average of 15,30,45,60 is

A. 37.5

B. 40

C. 38

D. 35

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Correct Answer: Option A

Explanation:
Sum=150. Average=37.5.

This question belongs to: Maths Average

Question #433

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Average of 25 numbers is 36. If one number 48 is replaced by 24, new average?

A. 36

B. 35.04

C. 35

D. 34

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Correct Answer: Option B

Explanation:
Change -24, decrease 0.96, new≈35.04.

This question belongs to: Maths Average

Question #434

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The average of 8 consecutive numbers is 25.5. Smallest number?

A. 21

B. 22

C. 24

D. 23

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Correct Answer: Option B

Explanation:
Average middle 4.5 and 5.5 =25.5. Smallest =25.5 -3.5=22.

This question belongs to: Maths Average

Question #435

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Average of 20, 40, 60, 80 is

A. 55

B. 50

C. 60

D. 45

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Correct Answer: Option B

Explanation:
Sum=200. Average=50.

This question belongs to: Maths Average

Question #436

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If average of 16 numbers is 42 and average of 12 is 40, average of remaining 4?

A. 46

B. 48

C. 45

D. 50

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Correct Answer: Option B

Explanation:
Sum16=672. Sum12=480. Remaining=192. Average=48.

This question belongs to: Maths Average

Question #437

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The average of all even numbers from 2 to 40 is

A. 19

B. 21

C. 20

D. 22

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Correct Answer: Option B

Explanation:
(2+40)/2=21.

This question belongs to: Maths Average

Question #438

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Average of 10 numbers 28. If average of 6 is 25, average of remaining 4?

A. 32.5

B. 30

C. 33

D. 35

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Correct Answer: Option A

Explanation:
Sum10=280. Sum6=150. Remaining=130. Average=32.5.

This question belongs to: Maths Average

Question #439

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The average of 28,35,42,49,56 is

A. 45

B. 40

C. 42

D. 44

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Correct Answer: Option C

Explanation:
Sum=210. Average=42.

This question belongs to: Maths Average

Question #440

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Average of 50 numbers 45. If 10 numbers average 55 removed, new average of 40?

A. 40

B. 42.5

C. 41

D. 43

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Correct Answer: Option B

Explanation:
Total=2250. Removed=550. Remaining=1700/40=42.5.

This question belongs to: Maths Average

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